sqoop export \
--connect "jdbc:mysql://192.168.88.80:3306/teach_mysql?useUnicode=true&characterEncoding=utf-8" \
--username root \
--password '123456' \
--table dm_class_attendance \
--hcatalog-database dm_zhixing04 \
--hcatalog-table dm_class_attendance \
-m 1